Buck is a deranged weasel that appears in Ice Age 3: Dawn of the Dinosaurs and briefly in Ice Age 4: Continental Drift.
Buck has a brown pelt with a creamy underbelly and darker brown spots dotted over him. He has a leaf patch over his right eye, and an overbite. He carries a large knife made from Rudy's tooth.
Due to staying in the Dino World, Buck has gone insane. He knows how to survive in the dinosaur world even with his insanity. He is quite brave, and loves teasing the crap out of Rudy and aggravating dinosaurs just for the fun of it.